remove-wp-admin-menu-item.php

<?php
// Customize menus
function slt_customizeAdminMenus() {

	// Remove theme / plugin editors
	// slt_removeSubmenu( 'themes.php', 'theme-editor.php' );
	// slt_removeSubmenu( 'plugins.php', 'plugin-editor.php' );
	// Remove comments / categories / tags
	slt_removeMenu( 'edit-comments.php' );
	slt_removeMenu( 'link-manager.php' );
	slt_removeMenu( 'upload.php' );
	slt_removeMenu( 'edit.php' );

}
add_action( 'admin_head', 'slt_customizeAdminMenus' );

// Remove item from a submenu
function slt_removeSubmenu( $parentMenuItem, $item ) {
	global $submenu, $menu;
	
	foreach ( $submenu as $menuKey => $menuItem ) {
		if ( $menuKey == $parentMenuItem ) {
			foreach ( $menuItem as $submenuKey => $submenuItems ) {
				if ( $submenuItems[2] == $item ) {
					unset( $submenu[$menuKey][$submenuKey] );
					break;
				}
			}
		}
	}
}

// Remove item from the main menu
function slt_removeMenu( $item ) {
	global $menu;
	
	foreach ( $menu as $menuKey => $menuItem ) {
		if ( $menuItem[2] == $item ) {
			unset( $menu[$menuKey] );
			break;
		}
	}
}
?>

If I need to remove a link of a plugin, for example the PageNavi... this is not in the array $submenu... what can I do?